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2.8
Power Specifications
The drive receives DC power (+5V) through a native SATA power connector (refer to1).
2.8.1
Power consumption
Power requirements for the drives are listed in the table in Table 4. Typical power measurements are based on an average of drives tested, under
nominal conditions, at 25°C ambient temperature. These power measurements are done with DIPM enabled.
•
Spinup current is measured from the time of power-on to the time that the drive spindle reaches operating speed.
•
Read/Write current is measured with the heads on track, based on three 64 sector read or write operations every 100 ms.
•
The drive supports two idle modes: Active Idle mode and Low Power Idle mode. Refer to Section 2.8.4 for power-management modes.
Table 4: DC Power Requirements
Power Dissipation
Spinup (max)
Write average
Read average
Idle, low power mode
1
Standby
Sleep
1.
Standby power is measured at steady state (after 200ms from transition)
2.8.2
Conducted noise
Input noise ripple is measured at the host system power supply across an equivalent 15-ohm resistive load on the +5 volt line.
Using 5-volt power, the drive is expected to operate with a maximum of 100 mV peak-to-peak square-wave injected noise at up to 20 MHz.
•
Equivalent resistance is calculated by dividing the nominal voltage by the typical RMS read/write current.
Note
2.8.3
Supply Voltage
Allowable voltage
Allowable noise/ripple
Allowable supply rise time
Allowable supply fall time
Seagate BarraCuda Product Manual, Rev. J
All models
+5V input average (25° C)
1.2A
2.40W
2.40W
1.45W
0.18W
0.18W
5V ± 5%
100 mV p-p max, 0-30 MHz
1-100 ms
<5 s
11
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